Showing papers on "Plant physiology published in 1973"

Ethylene and the germination and early growth of barley

Abstract: Barley seeds have been germinated in gas mixtures containing ethylene (up to 20 vpm) and various amounts of oxygen (0.5–21.0 per cent). When oxygen was adequate, ethylene had no effect on germination but decreased root growth and increased top growth. Ethylene-treated roots were short, broad and curled. When inadequate oxygen slowed seedling growth, ethylene had no effect on roots but increased top growth. Effects of carbon dioxide concentration and of the residual effects of ethylene on seedling growth are also discussed.

Accumulation of damaging concentrations of phosphorus by leaves of selkirk wheat

Abstract: Leaves of P-deficient wheat plants were damaged after 1 mM P was included in the previously zero P nutrient solution. Wheat plants continuously grown in 1 mM P in modified Hoagland's solution were not damaged. Maximum damage and P accumulation occurred in the apical regions of the youngest leaves. We attributed this leaf damage to the accumulation of abnormally high (in excess of 3 per cent dry weight) amounts of P in the leaves of P-deficient plants from nutrient solution that was nontoxic to plants containing adequate P. re]19720721

Yields of fungal protein from carob sugars

Abstract: The general scheme for microbial protein production (Gray, 1964, 1965, 1966) shows the conversion of green plant carbohydrates into fungal protein, which in turn can be converted to animal protein, which can then be used by man (GREEN PLANT CARBOHYDRATES ---+ FUNGUS PROTEIN --~ ANIMAL PROTEIN---+ MAN). We have already reported on the conversion of carob bean carbohydrates into fungal protein using the fungus Aspergillus niger, van Tieghem (Mitrakos et al., 1970). The carob bean sugars consist of a mixture of sucrose, glucose, fructose and maltose in a ratio of 5:1:1:0.7 (Mitrakos, 1968) and can be considered as a very good carbon source for fungal growth. In this paper we will present additional data on the growth of the fungus as well as the yield of dry mycelium and fungal protein under different nutritional conditions.

Improving the cross rhododendron impeditum × rhododendron ‘Elizabeth’ by temperature treatment

Abstract: The results of the cross R. impeditum × R. ‘Elizabeth’ (R. forrestii var. repens × R. griersonianum), a lepidote and an elepidote Rhododendron can be influenced by temperature. In the phytotron this cross was clearly more successful at temperatures below 20°C than at higher temperatures.

Auxin and yeast

Abstract: Introduction .............................................................................................................. 1 Auxin Action ........................................................................................................... 2 1. Auxin responsiveness in yeast ......................................................................... 2 2. Auxin action in yeast and higher plants ........................................................ 4 A. Inhibitor test .............................................................................................. 4 B. Auxin action and functional RNA ...................................................... 5 C. Action of gibberellie acid ......................................................................... 6 3. Mechanism of auxin action ............................................................................ 7 4. Auxin and yeast sexual hormones ................................................................... 9 General Discussion .................................................................................................. 10 Acknowledgments .................................................................................................... 11 References ................................................................................................................ 11

Effect of ultraviolet-light interruption on flowering inPharbitis seedlings

Abstract: Seedlings ofPharbitis nil, strain Violet, were exposed to ultraviolet (UV, 254 nm) light at various times of a 16-hr dark period for 60, 90, and 120 sec. When UV light was given at the 6th hr of the dark period, flowering was most inhibited irrespective of UV dosages. The inhibition pattern of flowering caused by UV light was similar to that caused by red light.